today there are different vibration isolators used in industries according to the weight and excitation frequency of the machines which have vibration. one of them is air spring which is in two types: convoluted air spring and membrane air spring. convoluted air springs are used to control vibrations in low frequency (usually lower than 10 hz) and the membrane ones are used in high frequency (u...

presented is a method of two-dimensional analysis of the active earth pressure due to simultaneous effect of both soil weight and surcharge of strip foundation. the study’s aim is to provide a rigorous solution to the problem in the framework of upper-bound theorem of limit analysis method in order to produce some design charts for calculating the lateral active earth pressure of backfill when ...

according to the few studies in active rest interval between the resistance exercises sets, it can’t be explicitly commented about the effect of it on performance in consecutive sets. purpose: the purpose of the current study was to compare different active and passive rest interval durations (3 and 4 minutes) on the numbers of repetition of bench press with 50 and 75 percent of 1rm in untraine...